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Electrokinetic-assisted gating in a microfluidic integrated Si nanoribbon ion sensor for enhanced sensitivity
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden ; Uppsala University, Sweden.
RISE - Research Institutes of Sweden, ICT, Acreo.
KTH Royal Institute of Technology, Sweden.
2018 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 262, p. 974-981Article in journal (Refereed) Published
Abstract [en]

Using the electrokinetic principle, we demonstrate a novel approach to modulate the response of an ion sensitive silicon-nanoribbon field-effect-transistor, effectively manipulating the device sensitivity to a change in surface potential. By using the streaming potential effect we show that the changes in the surface potential induced by e.g. a pH change can be accurately manipulated in a microfluidic-integrated chip leading to an enhanced response. By varying the flow velocity and the biasing condition along the microfluidic channel, we further demonstrate that the pH response from such a device can also be suppressed or even reversed as a function of the flow velocity and the biasing configuration. Experiments performed with different pH buffer shows that the sensor response can be enhanced/suppressed by several times in magnitude simply by using the streaming potential effects. A mathematical description is also presented for qualitative assessment of the electrokinetic influence on the gate terminal under different biasing condition. The approach presented here shows the prospect to exploit the electrokinetic modulation for developing highly sensitive nanoscale biosensors.

Place, publisher, year, edition, pages
2018. Vol. 262, p. 974-981
Keywords [en]
Electrokinetic effect, Ion sensitive field-effect transistor, Microfluidics, pH sensing, Silicon nanoribbon, Streaming potential, Electrodynamics, Field effect transistors, Flow velocity, Ion sensitive field effect transistors, Ions, Nanoribbons, pH effects, pH sensors, Surface potential, Enhanced sensitivity, Mathematical descriptions, Nanoscale biosensors, Qualitative assessments
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33420DOI: 10.1016/j.snb.2018.02.017Scopus ID: 2-s2.0-85042270625OAI: oai:DiVA.org:ri-33420DiVA, id: diva2:1188806
Note

Funding details: 2016-05051, VR, Vetenskapsrådet; Funding details: Familjen Erling-Perssons Stiftelse; Funding details: 2011.0113, Knut och Alice Wallenbergs Stiftelse; Funding text: The authors acknowledge financial support by the Knut and Alice Wallenberg foundation (contract no ( 2011.0113 )), Erling-Persson Family foundation and the Swedish Research Council ( 2016-05051 ).

Available from: 2018-03-08 Created: 2018-03-08 Last updated: 2018-03-16Bibliographically approved

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